How can I scaling a geometry using VEX?

[Masoud]

Hi guys,

I'm looking for the simplest way to scale a geometry, using VEX (by an attribute) and I would like to be able to define the pivot position, too.

I tried these codes. It works but I don't need the other transform parts (like Position, Rotation, and ...):

vector t=chv("Translate"), r=chv("Rotation"), pr=chv("pivot_rotation");
vector p = v@myPivot;
vector s = f@myScale;
matrix transform = maketransform(0,0,t,r,s,p,pr);
@P *= transform;

There is a VEX function:  scale(matrix &m, vector scale_vector);

But I don't know how to use it.

 

Thanks for helping.

Edited August 2, 2023 by Masoud

[Masoud]

I tried this one.
It works, but there is no Pivot option:

matrix m = ident();
vector myscale = chv("Scale");
scale(m, myscale);
@P *= m;

I need to set the pivot, too.

[ThomasPara]

vector pivot = chv("pivot");
@P -= pivot;
@P *= chf("scale");
@P += pivot;

Simplest uniform scale, with pivot

[Masoud]

Thank you Thomas.